package thinkingInJava.typeinfo.Proxy.InterfaceHidden;

//: typeinfo/HiddenImplementation.java
//Sneaking around package access.
import java.lang.reflect.*;
import thinkingInJava.typeinfo.Proxy.InterfaceHidden.packageaccess.HiddenC;

public class HiddenImplementation {
public static void main(String[] args) throws Exception {
 A a = HiddenC.makeA();
 a.f();
 System.out.println(a.getClass().getName());
 // Compile error: cannot find symbol 'C':
 /* if(a instanceof C) {
   C c = (C)a;
   c.g();
 } */
 // Oops! Reflection still allows us to call g():
 callHiddenMethod(a, "g");
 // And even methods that are less accessible!
 callHiddenMethod(a, "u");
 callHiddenMethod(a, "v");
 callHiddenMethod(a, "w");
}
static void callHiddenMethod(Object a, String methodName)
throws Exception {
 Method g = a.getClass().getDeclaredMethod(methodName);
 g.setAccessible(true);
 g.invoke(a);
}
} /* Output:
public C.f()
typeinfo.packageaccess.C
public C.g()
package C.u()
protected C.v()
private C.w()
*///:~

